Linda Evangelista at a city court yesterday.Lawrence Schwartzwald/Splashnews

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It’s a baby mystery no more.

The father of supermodel Linda Evangelista’s 4-year-old boy is none other than billionaire Frenchman Francois-Henri Pinault — who just happens to be the husband of actress Salma Hayek, The Post has learned.

Despite Evangelista’s rep denying Pinault’s paternity when confronted with it by The Post’s Page Six back in October 2007, the Victoria’s Secret stunner came to court yesterday in hopes of hashing out a support agreement with Pinault, the father of the boy, Augustin James.

The Manhattan magistrate’s court action confirms that the two-timing Pinault — CEO of the $28 billion conglomerate that owns Gucci, Bottega Veneta and Yves St. Laurent — is the daddy to two 4-year-olds by different world-famous beauties.

One is Valentina, acknowledged and cared for by her parents, Pinault and Hayek, who jet between France, New York and LA.

The other is Evangelista’s boy, unacknowledged by both the mogul and his actress wife, who has repeatedly insisted in interviews that Pinault has only three children — Valentina and two from his previous marriage to his first wife.